The 30-year-old has been fighting to clear his name and prove it was a 'mistake', and had asked that his B sample be tested knowing fully well that if found guilty he will be suspended from athletics for a period of two years.

Sepeng's long-time coach, Jean Verster told ASA website that he did not knowingly ingest an illegal substance, but is keeping his cards close to his chest regarding the possible reasons for the positive test.

He also queried why the authorities waited so long before contacting Sepeng to inform him the sample taken on February 21 had tested positive.

Verster said: "We can't say anything yet, but there are a few possible reasons for the positive test.

"We've written a letter to Athletics South Africa and to the IAAF in which Hezekiel says that he did not knowingly use any (banned) substances."